Single Slit Diffraction

The angular resolution of a 10 cm diameter telescope at a wavelength of 5000 is of the order of

For a parallel beam of monochromatic light of wavelength , diffraction is produced by a single slit whose width 'a' is of the order of the wavelength of the light. If 'D' is the distance of he screen from the slit, the width of the central maxima will be

The ratio of resolving powers of an optical microscope for two wavelengths and is :

Angular width of the central maxima in the Fraunhofer diffraction for = 6000 � is . When the same slit is illuminated by another monochromatic light, the angular width decreases by 30%. The wavelength of this light is,

In a Young's double slit experiment, a student observes 8 fringes in a certain segment of screen when a monochromatic light of 600 nm wavelength is used. If the wavelength of light is changed to 400 nm, then the number of fringes he would observe in the same region of the screen is